Piano pedal bug

[Georg Romstorfer]

Piano pedal bracket and RehearsalMark are in conflict after \break. The bracket
below the staff disappears as long as there is the mark above the staff.
Expected: The bracket should be shown from the beginning of the staff.

% ****************************************************************
% ly snippet:
% ****************************************************************

\version "2.11.33"
\paper { ragged-right = ##t }

\relative c' {
        c\sostenutoDown d e f
        \break
        \override Score.RehearsalMark #'self-alignment-X = #left
        \mark "Some text"
        e f g a b\sostenutoUp
}

% ****************************************************************
% end ly snippet
% ****************************************************************